* {
    padding: 0;
    margin: 0;
}

.fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #444;
}

.full {
    position: fixed;
    top: 0;
    z-index: 10000;
    width: 100%;
    float: left;
}

.top-nav li {
    display: inline;
    margin-right: 5px;
    color: #b0b0b0;
}

.top-nav a {
    font-size: 12px;
    color: #b0b0b0;
}

.top-nav a:hover {
    color: white;
    text-decoration: none;
}

.slider {
    height: 340px;
    width: 790px;
    margin: 100px auto;
    position: relative;
}

.slider li {
    position: absolute;
    display: none;
    list-style-type: none;

}


.slider li:first-child {
    display: block;
}

.arrow {
    display: none;
}

.slider:hover .arrow {
    display: block;
}

.arrow-left,
.arrow-right {
    font-family: "SimSun", "宋体";
    width: 30px;
    height: 60px;
    background-color: rgba(0, 0, 0, 0.1);
    position: absolute;
    top: 50%;
    margin-top: -30px;
    cursor: pointer;
    text-align: center;
    line-height: 60px;
    color: #fff;
    font-weight: 700;
    font-size: 30px;
}

.arrow-left:hover,
.arrow-right:hover {
    background-color: rgba(0, 0, 0, .5);
}

.arrow-left {
    left: 0;
}

.arrow-right {
    right: 0;
}

.wrap {
}
.wrap > ul {
    list-style: none;
}

.wrap > ul > li {
    float: left;
    margin-right: 10px;
    position: relative;
    font-size: 20px;
}
.wrap > ul > li > ul > li{
    font-size: 15px;
    margin-top: 10px;
}
.wrap a,.wrap a:link {
    display: block;
    height: 30px;
    width: 150px;
    text-decoration: none;
    color: #000;
    line-height: 30px;
    text-align: center;
}

.wrap li ul {
    position: absolute;
    top: 30px;
    display: none;
    list-style: none;
    text-align: center;
}